Freight cart

Abstract

The present invention provides a freight cart comprising a carriage as well as a bucket and a handle which are respectively located on front and rear sides of the carriage, the bucket is pivotally connected to the carriage, a double connecting rod assembly for driving the bucket to rotate relative to the carriage is also provided on the carriage, the double connecting rod assembly is pivotally connected to the bucket and the carriage respectively and forms a planar linkage mechanism together with the bucket and the carriage, the handle is transmissively connected to the double connecting rod assembly, and the handle is operated to make the planar linkage mechanism drivable to move the bucket relative to the carriage and switch the bucket between a storage position and a discharge position.

What is claimed is: 
     
       1. A freight cart comprising a carriage ( 1 ) as well as a bucket ( 2 ) and a handle ( 3 ) which are respectively located on front and rear sides of the carriage ( 1 ), characterized in that the bucket ( 2 ) is pivotally connected to the carriage ( 1 ), a double connecting rod assembly ( 5 ) for driving the bucket ( 2 ) to rotate relative to the carriage ( 1 ) is also provided on the carriage ( 1 ), the double connecting rod assembly ( 5 ) is pivotally connected to the bucket ( 2 ) and the carriage ( 1 ) respectively and forms a linkage mechanism together with the bucket ( 2 ) and the carriage ( 1 ), the handle ( 3 ) is transmissively connected to the double connecting rod assembly ( 5 ), and the handle ( 3 ) is operated to make the linkage mechanism drivable to rotate the bucket ( 2 ) relative to the carriage ( 1 ) and switch the bucket ( 2 ) between a storage position and a discharge position,
 wherein the freight cart further comprises a locking mechanism, the locking mechanism includes a first locking member ( 61 ) and a second locking member ( 62 ), and 
 wherein the first locking member ( 61 ) is pivotally connected to the carriage ( 1 ), and the second locking member ( 62 ) is fixed relative to the handle ( 3 ). 
 
     
     
       2. The freight cart according to  claim 1 , characterized in that the handle ( 3 ) is connected to the double connecting rod assembly ( 5 ) by a main bar ( 32 ). 
     
     
       3. The freight cart according to  claim 2 , characterized in that the double connecting rod assembly ( 5 ) includes a first connecting rod ( 51 ) and a second connecting rod ( 52 ) pivotally connected to each other. 
     
     
       4. A freight cart comprising a carriage ( 1 ) as well as a bucket ( 2 ) and a handle ( 3 ) which are respectively located on front and rear sides of the carriage ( 1 ), characterized in that the bucket ( 2 ) is pivotally connected to the carriage ( 1 ), a double connecting rod assembly ( 5 ) for driving the bucket ( 2 ) to rotate relative to the carriage ( 1 ) is also provided on the carriage ( 1 ), the double connecting rod assembly ( 5 ) is pivotally connected to the bucket ( 2 ) and the carriage ( 1 ) respectively and forms a linkage mechanism together with the bucket ( 2 ) and the carriage ( 1 ), the handle ( 3 ) is transmissively connected to the double connecting rod assembly ( 5 ), and the handle ( 3 ) is operated to make the linkage mechanism drivable to rotate the bucket ( 2 ) relative to the carriage ( 1 ) and switch the bucket ( 2 ) between a storage position and a discharge position;
 wherein the handle ( 3 ) is connected to the double connecting rod assembly ( 5 ) by a main bar ( 32 ), 
 wherein the double connecting rod assembly ( 5 ) includes a first connecting rod ( 51 ) and a second connecting rod ( 52 ) pivotally connected to each other, and 
 wherein the double connecting rod assembly ( 5 ) has two double connecting rod assemblies which are disposed symmetrically, and the main bar ( 32 ) has two main bars which respectively correspond to the two double connecting rod assemblies ( 5 ). 
 
     
     
       5. The freight cart according to  claim 1 , characterized in that the locking mechanism is used to lock all of kinematic pairs of the linkage mechanism when the bucket ( 2 ) is in the storage position. 
     
     
       6. The freight cart according to  claim 5 , characterized in that the locking mechanism further includes
 a locking flap ( 611 ) provided on the first locking member ( 61 ), a locking slot ( 6211 ) cooperating with the locking flap ( 611 ) being provided in the second locking member ( 62 ), the locking flap ( 611 ) being caught in the locking slot ( 6211 ) to implement locking between the first locking member ( 61 ) and the second locking member ( 62 ) when the bucket ( 2 ) is located in the storage position, and the first locking member ( 61 ) being operated to rotate about a pivotal shaft penetrating the first locking member ( 61 ) to enable the locking flap ( 611 ) to come out of the locking slot ( 6211 ) and unlock the locking between the first locking member ( 61 ) and the second locking member ( 62 ). 
 
     
     
       7. The freight cart according to  claim 6 , characterized in that a guide surface for guiding return of the locking flap ( 611 ) is also provided on the second locking member ( 62 ), and the guide surface is connected to an opening of the locking slot ( 6211 ). 
     
     
       8. The freight cart according to  claim 5 , characterized in that a stopper ( 131 ) for stopping rotation of the first locking member ( 61 ) and an elastic piece for driving the first locking member ( 61 ) to return are also provided on the carriage ( 1 ). 
     
     
       9. The freight cart according to  claim 5 , characterized in that a support part ( 132 ) which supports a free end of the bucket ( 2 ) when the bucket ( 2 ) is located in the storage position is also provided on the carriage ( 1 ). 
     
     
       10. A method of performing a discharging operation by use of the freight cart according to  claim 1 , comprising:
 pushing the freight cart to the discharge position and ensuring that the freight cart is stably parked in the discharge position; 
 pulling the first locking member ( 61 ) upwardly to release a locking flap ( 611 ) from a locking slot ( 6211 ) of the second locking member ( 62 ) and to unlock locking between the first locking member ( 61 ) and the second locking member ( 62 ); 
 continually pressing down the handle ( 3 ) to drive a main bar ( 32 ) to rotate downwardly so that a second connecting rod ( 52 ), a first connecting rod ( 51 ) and the bucket ( 2 ) are interlocked and the bucket ( 2 ) is inclined forwardly to reach the discharge position; and 
 keeping the bucket ( 2 ) in the discharge position until freight in the bucket ( 2 ) is completely discharged from the bucket ( 2 ) and finishing the discharging.